Blocking yourself from being seen in visions
Here is the background:
This all may sound insane, you may call me a troll, but I'm being dead serious.
Earlier tonight, I was over my friend's apartment and he showed me how he can see things that've happened, and see if someone's lying about something.
He turned out all the lights, lit a candle, and drew something like a rune on his hand. He waved his hands around the flame for a while and afterwards was able to tell me, in detail, about an event I never told to anyone.
I find this to be an invasion of personal space and I really don't like it. I also have some secrets from him that I would like to keep secret from him.
My question: Is there any way, at all, to keep him from seeing me, the things I've done, etc?
I am very desperate here. I know this all sounds crazy, but it's true. I am terrified and any help at all would be appreciated.